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Holter monitoring is the principal diagnostic procedure for arrhythmia. Holter monitor provides an extended (usually 24 to 48 hours) electrocardiogram (ECG or EKG) of heart’s electrical activity, including rhythm and rate. The test can be beneficial if symptoms are intermittent or if the patient’s physician suspects an arrhythmia and is unable to capture it using a standard ECG test. Holter monitoring is also useful in showing a change in rhythm over time while the patient goes about daily activities.